The Eleven-Tails (十一尾, Jūichibi) is a tailed beast created via the bureka experiment. Aku used Ankylosaurus DNA to ensure that he can become and separate from a Eleven-Tailed Ankylosaurus. In order to become it's Jinchūriki Aku had to separate it from his body and thanks to the friend in the dark he was able to. The Eleven-Tails is eventually defeated and sealed by Poji.

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